Answers by Arthur S.

First you must look for the longest chain of carbons to correctly determine the configuration. That is five carbons with a methyl group on number 4 so the second methylene group is attached to two other carbons and therefore secondary.
There is one tertiary carbon and the primary carbons are...

Just to add to Elizabeth,
The cores in your example are Argon and Krypton. Use the core a s a guide and as you add electrons to orbitals you would form new elements.
In the example, 4s1 is potassium then 4s2 is Calcium then next orbitals are the 3d orbitals and you have ten electrons total...

To add to Cristina,
The octet rule states that atoms look to have eight electrons in the outermost or bonding shell. Halogens have seven electrons in their outermost shell as an example fluorine has nine electrons, two of which or in the first orbital and seven in the second orbital. Fluorine...

Nicolette,
Assuming all operators are acceptable including powers, one such possibility is:
42 -22 +8 = 20
16-4+8 = 20
This assumes that powers can be added. I can find no way to 20 with just those operators you have listed.
Arthur

I think this is best approached this way:
If zero is the divisor then what dividend or value produces a result or quotient which is the number of times zero can be divided by it? Suppose the divisor is 1 then then quotient is equal to the dividend but for zero we cannot determine how many...

Maribel,
Not too hard really. The term two step equation comes form the operations being performed which are done in you guessed it two steps.
Example:
5X - 9 =31
Step 1 add 9 to each side
5X - 9 +9 = 31 +9
5X = 40
Step 2 divide each side by 5
5X/5 =...

Brenda,
Water is said to be polar because there is a net negative charge at the Oxygen end of the molecule and a net positve charge at the hydrogens end of the molecule. Water molecules therrefore behave like magnets in that they arrange themselves such that hydrogen bonds form between...

Mary,
2x +3 = x
You want to get like terms on each side of the equation so subtract x from each side to get
2x - x + 3 = x - x
simplify to get
x+3 = 0
then subtract 3 from each side
x + 3 - 3 = -3
so x = -3
now plug this value back in to...

Anne,
Observe that the sequence is decreasing by 1 1/4 each time.
so
7 1/2 - 1 1/4 = 6 1/4
and
6 1/4 - 1 1/4 = 5
therefore next in the sequence is
5 - 1 1/4 = ?
and so on and so on!
Hope that helps!
Art

Kailee,
Inthe case of
-7(n-1) you use the distributive property. so
-7*n + -7*-1
the coefficient of n is +1 so a negative time a positive is a negative, while a negative time a negative is a positive. Thus we get
:
-7n+1
now if say -7n +1 = 0 then
you...

Casey,
Yes but remember that for example
1/0.5 = 1/(5/10) so that you have to take the reciprocal of 1/(5/10) which is
10/5 = 2
so the decimal should be converted into a fraction for simplicity
Hope that helps!
Art

Michaela,
If the height = x then
the base = x+3
and the equation is the sum of the heigh and the base is equal to 305
therefore
x+x+3 = 305
2x +3 = 305
you can solve for x and will find that the base is indeed 3ft taller than the height.
Base =...

Ollie,
I suppose s= the side of a square figure so
Asquare= s * s = s2
also
since a square is really two right triangles together when a diagonal is drawn then
the area of one triangle is
Atriangle = 1/2bh where b=the base and h= the height
so the area of the square...

Mitze,
If the equation is (z+7)/8 = (z+8)/9 it does have a solution!
First we multiply each side by 9 to get
9(z+7)/8 = z+8
then we multiply each side by 8 to get
9(z+7) = 8(z+8)
simplify
9z + 63 = 8z +64
subtract 8z form...

Molly,
Use the foil method. You know that two possible combinations will produce 4x^2
4x * x or 2x * 2x
You know that the last term factors could be 9*1 or 3*3
The real question is what will produce the middle term? 4*3 = 12 as well as 12*1 and 6*2.
Notice that 4 ans...